Answers to those Homework Problems that you must write up and turn in at recitation (i.e. the HW problems not on the Mastering Physics web site) will be posted here. P25. For both components, the magnitude turns out to be k(lambda)/R E2. (a) proof (b) V(rf)-V(ri)=(rho/4epsilon0)(ri²-rf²) (c) answer will be posted after this problem is due (d) answer will be posted after this problem is due W68. (a) (pi/3)R²J_0 (b) (mu0/6r)R²J_0 (c) (mu0/2)rJ_0(1-(2r/3R)) sol H12. (a) Pind = 3.11 W; Pres = 7.40 W; Pbat = 10.51 W (b) 18.7 J (c) 5.10 J (d) 13.6 J